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# 两直线平行与垂直的判定 - PowerPoint PPT Presentation

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## PowerPoint Slideshow about '两直线平行与垂直的判定' - umika

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(1)A(0,1),B(-1,0);

(2)C(0,2),D(2,4);

y

x

o

y

B

A

C

O

x

y

x

O

(2)已知四边形ABCD的四个顶点分别为A(0,0),B(2,-1),C(4,2),D(2,3),试判断四边形ABCD的形状，并给出证明.

D

C

A

B

y

x

O

y

C

B

x

O

A

(2)已知A(5,-1),B(1,1),C(2,3)三点，试判断三角形ABC的形状.

(1)平行 (2)垂直

y

Q

P

O

x

A

B

（1）试判断直线AB与AQ的位置关系, 并证明。

（2）试判断四边形ABPQ的形状，并证明。

1:如果直线l1,l2的斜率为k1,k2，那么：

2:如果直线l1,l2的斜率为k1,k2，那么：

l1⊥l2  k1k2=－1